Publication date: Jul 2018
Abstract:
In this Letter, we wish to point out that the distinguishing feature of
magnetic Penrose process (MPP) is its super high-efficiency exceeding
100 per cent (which was established in mid 1980s for discrete particle
accretion) of extraction of rotational energy of a rotating black hole
electromagnetically for a magnetic field of milli Gauss order. Another
similar process, which is also driven by the electromagnetic field, is
Blandford-Znajek mechanism (BZ) that could be envisaged as high magnetic
field limit MPP as it requires threshold magnetic field of order
104 G. Recent simulation studies of fully relativistic
magnetohydrodynamic (MHD) flows have borne out super high-efficiency
signature of the process for high magnetic field regime; viz BZ. We
would like to make a clear prediction that similar simulation studies of
MHD flows for low magnetic field regime, where BZ would be inoperative,
would also have superefficiency.
Authors:
Dadhich, Naresh; Tursunov, Arman; Ahmedov, Bobomurat; Stuchlík, Zdeněk;